[@Jangel13]

Understood.  So that type of rock is likely in the substrata but it isn't available on the surface in the local area.  Would the starting cave have any?

After all, those are the only two places that Skrik has been to at this point and he doesn't know where the others went or how to find any of them to ask any questions.  He's now isolated and will have to figure everything out on his own.